Hey Gary.
If you're going to a gunnery site. I might suggest to you. That you get a metal detector. So that you may avoid any unexploded ordinances (bombs) that hadn't exploded yet.
Very dangerous place to be, if you don't know what you're doing?
My uncle almost lost his leg to a unexploded 500 pound bomb. So you can imagine how far away it was when it exploded from him?
A deer they were chasing set the bomb off. Lucky for them. They had a deer there to save their lives!!
If the place you're going to is just "only" a place where they shoot guns. Then that's not a problem!!